Home / 12,999.21-17,936.19-7,964.57

Finding the Fourth Proportional to 12,999.21, 17,936.19 and 7,964.57

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Solution

The fourth proportional to 12,999.21, 17,936.19 and 7,964.57 is: 10,989.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,999.21 : 17,936.19 = 7,964.57 : x
  2. Step 2: Convert to fraction form
    12,999.21/17,936.19 = 7,964.57/x
  3. Step 3: Cross multiply
    12,999.21x = 17,936.19 × 7,964.57
  4. Step 4: Simplify right side
    12,999.21x = 142,853,951.11
  5. Step 5: Solve for x
    x = 142,853,951.11/12,999.21
  6. Step 6: Final answer
    x = 10,989.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.